function openwin(url,winName,width,height,scrolls){
	xposition=0; yposition=0;
	if ((parseInt(navigator.appVersion) >= 4 )){
		xposition = (screen.width - width) / 2;
		yposition = (screen.height - height) / 2;
	}
	theproperty="width="+width+",height="+height+",fullscreen=0,location=0,menubar=0,directories=0,resizable=1,scrollbars="+scrolls+",status=0,titlebar=0,toolbar=0,hotkeys=0,screenx="+xposition+",screeny="+yposition+",left="+xposition+",top="+yposition;
	window.open(url,winName,theproperty);
}